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We report a method for cobalt-catalyzed, aminoquinoline-directed sp 2 C-H bond carbonylation of sulfonamides. The reactions proceed in a dichloroethane solvent, and employ diisopropyl azodicarboxylate as a carbon monoxide source, Mn(OAc) 2 as a cooxidant and potassium pivalate as a base. Halogen, ester, and amide functionalities are compatible with the reaction conditions. This method allows for a short and efficient synthesis of saccharin derivatives.

Aminoquinoline-directed, cobalt-catalyzed carbonylation of sulfonamide sp2 C–H bonds

Aminoquinoline-directed, cobalt-catalyzed carbonylation of sulfonamide sp² C–H bonds